net.sf.saxon.s9api

## Enum OccurrenceIndicator

- java.lang.Object
- - java.lang.Enum<OccurrenceIndicator>
  - - net.sf.saxon.s9api.OccurrenceIndicator

- All Implemented Interfaces:
    Serializable, Comparable<OccurrenceIndicator>

      public enum OccurrenceIndicator
      extends Enum<OccurrenceIndicator>

  Represents one of the possible occurrence indicators in a SequenceType. The four standard values are ONE (no occurrence indicator), ZERO_OR_ONE (?), ZERO_OR_MORE (*), ONE_OR_MORE (+). In addition the value ZERO is supported: this is used only in the type empty-sequence() which matches an empty sequence and nothing else.

- - ### Enum Constant Summary

    Enum Constants
    Enum Constant and Description
    `ONE`
    `ONE_OR_MORE`
    `ZERO`
    `ZERO_OR_MORE`
    `ZERO_OR_ONE`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `allowsMany()` Ask whether this occurrence indicator permits a sequence containing more than one item.
    `boolean` | `allowsZero()` Ask whether this occurrence indicator permits an empty sequence.
    `protected int` | `getCardinality()`
    `protected static OccurrenceIndicator` | `getOccurrenceIndicator(int cardinality)`
    `boolean` | `subsumes(OccurrenceIndicator other)` Ask whether one occurrence indicator subsumes another.
    `static OccurrenceIndicator` | `valueOf(String name)` Returns the enum constant of this type with the specified name.
    `static OccurrenceIndicator[]` | `values()` Returns an array containing the constants of this enum type, in the order they are declared.

    - ### Methods inherited from class java.lang.Enum

      `clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf`

    - ### Methods inherited from class java.lang.Object

      `getClass, notify, notifyAll, wait, wait, wait`

- - ### Enum Constant Detail

    - #### ZERO

          public static final OccurrenceIndicator ZERO

    - #### ZERO_OR_ONE

          public static final OccurrenceIndicator ZERO_OR_ONE

    - #### ZERO_OR_MORE

          public static final OccurrenceIndicator ZERO_OR_MORE

    - #### ONE

          public static final OccurrenceIndicator ONE

    - #### ONE_OR_MORE

          public static final OccurrenceIndicator ONE_OR_MORE

  - ### Method Detail

    - #### values

          public static OccurrenceIndicator[] values()

      Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

          for (OccurrenceIndicator c : OccurrenceIndicator.values())
              System.out.println(c);

      Returns:
        an array containing the constants of this enum type, in the order they are declared

    - #### valueOf

          public static OccurrenceIndicator valueOf(String name)

      Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)
      Parameters:
        `name` - the name of the enum constant to be returned.
      Returns:
        the enum constant with the specified name
      Throws:
        `IllegalArgumentException` - if this enum type has no constant with the specified name
        `NullPointerException` - if the argument is null

    - #### getCardinality

          protected int getCardinality()

    - #### getOccurrenceIndicator

          protected static OccurrenceIndicator getOccurrenceIndicator(int cardinality)

    - #### allowsZero

          public boolean allowsZero()

      Ask whether this occurrence indicator permits an empty sequence.
      Returns:
        true if the occurrence indicator is one of `ZERO`, `ZERO_OR_ONE`, or `ZERO_OR_MORE`
      Since:
        9.2

    - #### allowsMany

          public boolean allowsMany()

      Ask whether this occurrence indicator permits a sequence containing more than one item.
      Returns:
        true if the occurrence indicator is one of `ZERO_OR_MORE` or `ONE_OR_MORE`
      Since:
        9.2

    - #### subsumes

          public boolean subsumes(OccurrenceIndicator other)

      Ask whether one occurrence indicator subsumes another. Specifically, `A.subsumes(B)` is true if every sequence that satisfies the occurrence indicator B also satisfies the occurrence indicator A.
      Parameters:
        `other` - The other occurrence indicator
      Returns:
        true if this occurrence indicator subsumes the other occurrence indicator
      Since:
        9.1

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